Holly Willoughby and Phillip Schofield were stunned today when some famous faces swung by to stop This Morning.

Ant McPartlin and Dec Donnelly, who were supposed to appear on a VT, came charging outside Television Centre to gatecrash the show.

Holly and Phil had no idea what was going on as Ant shouted: "Stop the television. Stop this nonsense."

The Geordie duo explained that they had a little surprise for the pair to celebrate their 10th anniversary presenting together.

"I don't believe you're here," cried Holly as Ant and Dec ripped up their scripts and took them inside for more surprises.

Ant and Dec suddenly emerged through the Television Centre doors (Image: ITV)

The Geordie duo stopped This Morning to deliver a surprise (Image: ITV)

Excited Ant said: "You might be wondering why we've gatecrashed."

Elaborating, Dec explained: "We've got a little surprise for you. It was 10 years ago. September 2009. A fresh faced Holly Willoughby joined this silver fox on the This Morning sofa for the very fist time.

Ant added: "The stars aligned and a decade on...This Morning without you would be like fish without chips."

Holly and Phil had no idea what was happening (Image: ITV)

Ant and Dec wanted to join the celebrations (Image: ITV)

The Britain's Got Talent presenters then dragged the hosts inside for a 'This Is Your Life' style look back over the years.

The entire This Morning team gathered in the studio as Ant and Dec hosted 'This Is Your Anniversary'.

A number of special guests sent their love, including Gino D'Acampo by video and Miriam Margolyes live from Australia.

Phil and Holly kept asking 'what is happening?' (Image: ITV)

This is your anniversary (Image: ITV)

The big surprise came as a shock to Holly and Phillip, who were convinced their celebrations had happened at the start of the show.

"Hopefully the crew have really pushed the boat out for us," said Phillip.

The presenters were very underwhelmed when a single crew member came out with a small chocolate cake.

The crew member dumped the cake on the desk and tooted a party horn before walking off.

"Oh thanks," said Phillip, as they blew out the candle on the cake.

Holly clung onto Phil during her first day on This Morning (Image: ITV)

The pair looked back on their first episode together (Image: ITV)

The pair also looked back on their very first day together - with Holly admitting she was very scared.

As they watched the clip, Holly said: "Holding onto you for dear life. So nervous. So didn't want to mess it up. That's what I remember thinking."